Date: Thu, 04 Oct 2001 13:39:41 +0930 From: "Thyer, Matthew" <Matthew.Thyer@dsto.defence.gov.au> To: Andrew Gallatin <gallatin@cs.duke.edu> Cc: "Brandon D. Valentine" <bandix@looksharp.net>, current@freebsd.org Subject: Re: NIS client performance seems very poor under network load Message-ID: <3BBBE105.9863D667@dsto.defence.gov.au> References: <20010928022500.I24843-100000@turtle.looksharp.net> <3BBAD3F3.241A1FEE@dsto.defence.gov.au> <15291.10120.604882.602699@grasshopper.cs.duke.edu>
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Andrew Gallatin wrote:
>
> Thyer, Matthew writes:
> >
> > Now xterm 1 has the message "yp_first: clnt_call: RPC: Timed out"
> > as its first line and xterm 2 has two of these messages.
> The problem is that there is no global caching of NIS maps. Each app
> maintains its own cache..
Since these are libc functions being used (gethostbyname, gethostbyaddr,
getpwent etc etc) it is under the control of the operating system to
do such caching and if most other operating systems do cache we are
not likely to see many apps caching themselves.
So the answer is a name service caching daemon ala nscd on Solaris.
That's my preferred option as we still have control and can
invalidate cache entries (nscd -i passwd) if required.
The Solaris nscd is quite configurable.. see /etc/nscd.conf from
Solaris 7:
#
# Copyright (c) 1994 by Sun Microsystems, Inc.
# All rights reserved.
#
#ident "@(#)nscd.conf 1.3 96/10/09 SMI"
#
#
# Currently supported cache names: passwd, group, hosts
#
# logfile /var/adm/nscd.log
# enable-cache hosts no
debug-level 0
positive-time-to-live passwd 600
negative-time-to-live passwd 5
suggested-size passwd 211
keep-hot-count passwd 20
old-data-ok passwd no
check-files passwd yes
positive-time-to-live group 3600
negative-time-to-live group 5
suggested-size group 211
keep-hot-count group 20
old-data-ok group no
check-files group yes
positive-time-to-live hosts 3600
negative-time-to-live hosts 5
suggested-size hosts 211
keep-hot-count hosts 20
old-data-ok hosts no
check-files hosts yes
Other options are to follow IRIX and have "nsd" and nsadmin to
control it but I think following Sun would be more popular.
--
Matthew Thyer Phone: +61 8 8259 7249
Science Corporate Information Systems Fax: +61 8 8259 5537
Defence Science and Technology Organisation, Edinburgh
PO Box 1500 Edinburgh South Australia 5111
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